Hi,

And/or another way I was just thinking that I could solve my problem, is there a way that I could open a custom window/pane that let the user either choose the value from a dropdown and/or enter their own value?

Thanks – Greg

You can use autocomplete control, that allow entering value and suggest options like dropdown while you type.
Refer demos/integration/autocomplete.php

Any ideas on how to show all potential values for autocomplete?   Maybe some Javascript which uses onFocus to show all the values?

OK, I managed to hack autocomplete so it works like a Combobox:

$col[“editoptions”][“onfocus”] = “$( ‘#office’ ).autocomplete( { search: ”, minLength: 0 } );”;

This will display all potential values of autocomplete when the field contains no next.

Reference:  https://api.jqueryui.com/autocomplete/

Thanks for the update.